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-rw-r--r--src/focaccia/parser.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/focaccia/parser.py b/src/focaccia/parser.py
index f115f3d..950f462 100644
--- a/src/focaccia/parser.py
+++ b/src/focaccia/parser.py
@@ -62,7 +62,7 @@ def parse_snapshots(json_stream: TextIO) -> Trace[ProgramState]:
 def serialize_snapshots(snapshots: Trace[ProgramState], out_stream: TextIO):
     """Serialize a list of snapshots to out JSON format."""
     if not snapshots:
-        return json.dump({}, out_stream)
+        return json.dump({}, out_stream, indent = 4)
 
     arch = snapshots[0].arch
     res = {